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COMPOSITION AND MOLD POR THE MANUFACTURE OF ARTICLES FROM ARITIELQIAL SLATB.

N0. 299,566. Patentedv une 3, 1884.

NITED STATESI PATENT' OFFICE.

JOHN wns'rLEY MCKNIGIIT, on WASHINGTON, DISTRICT or COLUMBIA.

COMPOSITION AND- MLn 'FIOR THE MANUFACTURE or AIITIcLIi's` FROM ARTIFICIAL sLA'TE.

sPncI'r'IcA'rfoN forming' peut of Lettere Parent-Ne. 299,566; dared ,I uee 3, 1884.

ponemos inea November T. lees. xe menemZ/K n -I To all whom" it may 'conccrm-.e'j 1 Be it known. that I, J.-VI.1IICKi1eHr,Ie

citizen of the United States, residing at Washhad therein to the accompanying drawings.

ington cit'y, in the District of Columbia, have invented certain newand useful Improvements in Composition'and' Molds for the Manufacture of A rtibles from Artificial Slate, of which the following is a specification, reference being Myinvention relates to molds for the manufacture of articles from artificial slate or stone, and to a composition of matter from which the artificial-slate is made.

Referring to the'drawings, Figure] is atop View of a mold with the ornamental .plate tllerein. Fig. 2 is a sectional view of Fig. 1. Fig'. 3 isa sectional View of a wash-tub havv ing a metal rubbing-surface secured to its inner side. Fig. 4 is asectional view of a clock- -case in the mold. Figs'. 5 and 6 are sectional.

views of a bath-tub and coffin, respectively.

Fig. 7 is a sectional vierir of the arrangement of refrigerator, wash -tub, and sink as ar ranged in kitchen.

-Great diiiiculty has been heretofore expeT rienced by persons engaged in the' manufacture of articles'from quick-setting cement, by the molds (which are usually made of wood) becoming saturated, warped, land distorted by the absorption of water from the plastic or semi-plastic composition .deposited in them to form the articles, so thatinorder to carry on a large business in this industrya considerable amount of money is -necessarily tied up in4 molds. Where meta-l molds are used the action of the moisture together with the ch'emiLi cals used in the composition tend to rust or'l corrode the sa'me and mak-e them uniit for use.

I 4overcome these diilicultiesby lining the nv 40 side portions of the molds with suitable ma,- terial which will .not only protect the main portions of the mold from the destructiveef-` feets,l of water and acids, -but willkeepthe in'- -sid'e of the moldstrue and smooth at alltimes,

and the molds can'be-'used continuously', @11d v 'as soon as one article-has been. formed'the molds can be filled again and again without having to keep a large stock of moldso'n hand.

In the drawings, A indicates-the main body 5e ef the meld, which may be made of weed, iron, or any suitable material, and of the desired 'form 'to produce 'the article required. l The The material abovemevtionedisspecially adapted for the lining of moldsmade of wood, and such lining may be secured to the inner surfaces of the' molds by screws, o r in any suitable man'ner.. This material mayalso bensed i for the, lining of metal molds, if desired; but IA prefer to line 4the metal molds with a vitriii able substance-which fuses below thev meltingpoint of iron, and such as is used in the manulfacture of granitized' sheet known in the market. y It is often ldesirable to produce designs in 'relief or in depression on' articles made of artificial-slate, stone, or marble, and where such a-re to be produced inrelief, I cut into the botmetah as is Well tom or sides of the mold'the desired desigm' so that when the articles are molded -therein the designs or ornaments will be produced in relief on the article. If, on the other hand, the design is to be produced in depression, I

place within or attach to the mold the desired design, which may be struck up from sheet iron, brass, lead,.or other suitable material, and then pour the plastic or semi-plastic composition over the same, and fill the molds to the desiredheiglitto form the articles. This will produce in' depression the required designor ornamentation. or inscriptions areto be produced, I prefer to strike 'them up from sheet metal, either in 're- 'lief prin depression, as is preferred, then coat vsuch sheet metal-with the vitriiable compositi0 nbake it to the required degree, and place the same in the bottom or'side of the mold. This will be found to be very effective, and will produce the best of results.

I. will now proceed to describe the ingredient-s I use in the manufacture of my artificial slate, .and the proportions in whieh I prefer to use them. The proportions may, however, be varied within certain limits without departing from the spirit of my invention. To one barrel of Portland r'other suitable cement take one lilaclr, one pouu "enetian red or other nun- Where entablatures pound oxide of iron, three pounds metallic roo red on'epound drop-black,twopounfs'lamp# eral'color, siii poundspulverized alum mined dry with the cement, and' one ga on soluble gl ss inthirteen andone-half gallons of Water.v

therewith of a sufficient quantity of thev solution of one gallon of the solution one barrel o' water. The articles ro are then cast into the desired form in tliefmolds 'of the 'character heretofore described, and when thoroughly set are removed from the molds and allowed to dry. The articles are then finished with a coat of boilfe'd/linseeihoil r glycerine well rubbed in with French putty'pwde r`or finely-ground litlxarge suitably colored. -Iwill now proceed to describe some of the articles-which I propose to make from artifi- 2o calslate, although I do not limit myselfv to such articles.

In Fig. 4 I have shown aelock-case made in imitation of slate and cast. in a mold of the character described, and strengthend by a net- :5 vrork of wire-gauze embedded in the cement.

Figs. 5' and 6 illustrate a bath-tub and coffin, respectively, made of the same material and treated 1n the manner described, and havinga net-work of wire embedded therein.

3oA In Fig 7 I have shown a convenient arrangement or articles intended for kitchenuse, in whichv a refrigerator, wash-tubs, and sink. are placed in juxtaposition. These articles may be made at the factory and sold as articles of trade from the stores. I may also `construct them in the kitchen or other portions E.of the house wherelthey are intended to be @sed by casting the same in position Where .they are intended to be used, thus avoiding tithe expense and liability to breakage incident to moving such heavy articles.

In Fig.- 3 -I`-show` a wash-tub or tank in which thel washing or rubbing surface is madeA of a sheet jof .corrugated zinc. The piece of corrugated vzinc is bent at the ends and placed in the molds in the proper. position. The cem- A 4'c lntis then poured in and allowed to set, thus embedding. the ends of the zinc-plate in Athe f slate and producing an article for 5o lgundrruses possessing valuable qualities.

plates in the plastic compound, I may secure 'to thc'back part of such, plates, headed pin's,11 V

Instead of embedding the edges of the metal or lugs, which when embedded iu the compo sition will hold the corrugated plate or platesv firmly in position. 'f g The -corrugated metal plate is indicated 'at I-I, and the lugsfor holding the same t0 the body of the article at H.

Both forms of fastening-i. e., the embedded edgesand the headed pinsare shown.

Havingl thus described my invention, what I claim and desire to secure by -Letters Patent,is- 1. A'nold for. the manufact-ure of articles of 65 artificial slate, stone, vor marble, havinga facing of vitreous or vitrifiable material fused thereon, as set forth.

2'. A composition-for artical slate, consisting of cement, oxide of iron, metallic red, 7o drop-black, lamp-black, Venetian red, soluble glass, pulverized alum, and solution of ironrust and vinegar, in substantially the proportions set forth.

3. Themethod herein describedof finishing artificial slate, which consists in coating the same with boiled lins'eed-oil or glycerine, and

.rubbing the same. thoroughly into tlie article with French putty-powder or' finely-ground litharge, suitably colored, as set forth. 8c

' 4. `As a new article of manufacture, awashtub having 'a washingsurface of a sheet`of corrugated zinc, the edges of which are embedded in the artificial slate of which the body -of the tub is composed,'as set forth. 85

5. A'wash-tub composed of artificial slate, artificial stone, or artificial marble, having a washing or rubbing surface of corrugated sheet-zinc or other suitable metal, the edges of which are embedded-or otherwise secured 9o -to the sloping inner surface of said tub, as set forth.

In testimony whereof Iaix my signatnrein presence of two wltnesses.

'JOHN WEs'rtEY MCKNIGT.

Witnesses: I

C. S. DRURY, CLARENCE L. ALEXANDER. 

